Graylog2 is an open source syslog-compatible log aggregator.

It consists of a server component implemented in Java which accepts the syslog messages via syslog protocol over TCP or UDP and stores them in a MongoDB database (0.9.5p2 and before) or ElasticSearch (since 0.9.6).

The second component is a webinterface implemented in Ruby with Ruby on Rails which allows the user to perform searches and a wide range of analytics on the collected log messages.

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